timekeeping: Add suspend and resume of clock event devices
Some clock event devices, for example such that belong to PM domains,
need to be handled in a spcial way during the timekeeping suspend
and resume (which takes place in the system core, or "syscore",
stages of system power transitions) in analogy with clock sources.
Introduce .suspend() and .resume() callbacks for clock event devices
that will be executed by timekeeping_suspend/_resume(), respectively,
next the the clock sources' .suspend() and .resume() callbacks.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index acba8943..8a7096f 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -97,6 +97,8 @@
void (*broadcast)(const struct cpumask *mask);
void (*set_mode)(enum clock_event_mode mode,
struct clock_event_device *);
+ void (*suspend)(struct clock_event_device *);
+ void (*resume)(struct clock_event_device *);
unsigned long min_delta_ticks;
unsigned long max_delta_ticks;
@@ -156,6 +158,9 @@
freq, minsec);
}
+extern void clockevents_suspend(void);
+extern void clockevents_resume(void);
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern void clockevents_notify(unsigned long reason, void *arg);
#else
@@ -164,6 +169,9 @@
#else /* CONFIG_GENERIC_CLOCKEVENTS_BUILD */
+static inline void clockevents_suspend(void) {}
+static inline void clockevents_resume(void) {}
+
#define clockevents_notify(reason, arg) do { } while (0)
#endif